As long as I remember we had Christmas Food, surprisingly in Christmas time, in very traditional way. All the family, including the DF/DA'd branches were invited to join the meal and enjoy family time together. No tree and decorations (except much candles), no presents (except what we got from DA/DF families), no singing (which I'm grateful for). I can't really label it as Christmas celebration, but it was not far from it anyway.
CP